HERS Scores

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BPC Homes Earn Exceptional HERS* Scores

*Home Energy Rating System (HERS) is a national standardized method for comparing home energy performance.  It is based upon energy-related factors, including insulation, windows, mechanical systems, and a blower door test for air tightness.

The scoring system was dramatically changed between 2003 and 2004 and so the scoring can be confusing when comparing homes before and after the change.

  • Starting in 2004, the scoring system was changed so that the LOWER the HERS Score the more energy efficient the home is.
  • Up until 2003 the HIGHER the HERS Score the more energy efficient the home was.
  • The two different systems also used a different scoring system as explained below.

Up through 2003, when higher scores were better, a house that met normal building codes scored 80. For each 5% reduction in total energy consumption, +1 point was added. And so an EPA Energy Star rated house scored 86 or more and a Zero Energy House scored 100.

Starting in 2004, lower scores were now better. A house that meets code scores 100. For every 1% reduction in total energy consumption, -1 point.  Therefore an Energy Star home will score 80, which is a 20% improvement in efficiency. A Zero Energy House will score 0 (zero), meaning it uses 100% less energy from the power grid.

2004 to Current: LOWER HERS Scores are Better

A HERS score of 0 (zero) means the home either uses NO energy from the power grid or makes as much (clean) energy as it uses from the power grid netting out to a Zero use of power from the power grid. A negative HERS score means the home generates more energy than it uses from the power grid.

In most places in our service area, homeowners receive credit for the clean energy their home puts into the power grid, offsetting the cost of the power they may use. This can result in as low as zero power grid energy costs for the homeowner.

Bolded Projects in this table are Net Zero Homes or Better

Project Town
Project Type
Year
HERS Score (LOWER is better)
Efficiency Higher by*
Yorktown Heights, NY New Custom Home 2016 0 100%
Ridgefield, CT Gut Rehab, Renovation & Addition 2016 -1 101%
Westport, CT New Custom Home 2016 11 89%
New Milford, CT New Custom Home 2016 49 51%
Bethany, CT Gut Rehab, Renovation & Addition 2015 37 63%
Watertown, CT New Custom Home 2014 -17 117%
Norwalk, CT New Custom Home 2014 -8 108%
New Canaan, CT New Custom Home 2014 -10 110%
Westport, CT Gut Rehab, Renovation & Addition 2013 45 55%
Danbury, CT New Custom Home 2013 35 65%
Ridgefield, CT New Custom Home 2013 8 92%
New Fairfield, CT New Custom Home 2012 37 63%
Ridgefield, CT Complete renovation 2012 41 59%
Norwalk, CT New Custom Home 2012 8 92%
New Haven, CT Complete renovation 2011 42 58%
Ridgefield, CT Gut Rehab, Renovation & Addition 2011 40 60%
Ridgefield, CT Complete renovation 2010 42 58%
Ridgefield, CT New Custom Home 2010 41 59%
Norwalk, CT New Custom Home 2010 48 52%
Ridgefield, CT Gut Rehab, Renovation & Addition 2009 44 56%
Ridgefield, CT Gut Rehab, Renovation & Addition 2009 37 63%
New Canaan, CT New Custom Home 2009 14 86%
Sharon, CT New Custom Home 2008 46 54%
Ridgefield, CT Gut Rehab, Renovation & Addition 2008 62 38%
Bethany, CT New Custom Home 2007 38 62%
Norwalk, CT Gut Rehab, Renovation & Addition 2007 62 38%
Norfolk, CT New Custom Home 2007 37 63%
Ridgefield, CT New Custom Home 2006 58 42%
Ridgefield, CT New Custom Home 2006 58 42%
Ridgefield, CT Gut Rehab, Renovation & Addition 2006 59 41%
Ridgefield, CT Gut Rehab, Renovation & Addition 2006 57 43%
Stamford, CT Gut Rehab, Renovation & Addition 2004 58 42%

* Percentage improvement over normal (model) building code. Note that the amount of energy required to heat and cool a BPC home versus a house built to code is generally reduced by a significantly greater percentage than indicated by this statistic.

2000-2003: HIGHER HERS Scores are Better

Project Town
Project Type
Year
HERS Score (HIGHER is better)
 Efficiency Higher by*
Redding, CT New Custom Home 2003 91.2 26%
Westport, CT Gut Rehab, Renovation & Addition 2003 90.8 24%
Bethany, CT New Custom Home 2002 91.6 28%
Roxbury, CT
New Custom Home 2001 90.8 24%
Roxbury, CT New Custom Home 2000 90.1 20.5%

* Percentage improvement over normal (model) building code. Note that the amount of energy required to heat and cool a BPC home versus a house built to code is generally reduced by a significantly greater percentage than indicated by this statistic.